[PATCH 08/10] arch: introduce strict_ioremap

In preparation for enabling memremap(), add support for strict mappings.
strict_ioremap_<type>() returns NULL if the arch does not implement the
mapping type, rather than falling back silently to ioremap().

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
include/linux/io.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/include/linux/io.h b/include/linux/io.h
index 58482241c95c..080a4fbf2ba4 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -130,6 +130,27 @@ static inline void __iomem *ioremap_uc(resource_size_t offset,
}
#endif

+static inline void __iomem *strict_ioremap_cache(resource_size_t offset,
+ unsigned long size)
+{
+#ifdef ioremap_cache
+ return ioremap_cache(offset, size);
+#else
+ return (void __force __iomem *) NULL;
+#endif
+}
+
+static inline void __iomem *strict_ioremap_wt(resource_size_t offset,
+ unsigned long size)
+{
+#ifdef ioremap_wt
+ return ioremap_wt(offset, size);
+#else
+ return (void __force __iomem *) NULL;
+#endif
+}
+
+
/*
* Some systems do not have legacy ISA devices.
* /dev/port is not a valid interface on these systems.

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